6.0.0

Backwards Incompatible Changes:

• Remove support for EOL Python 3.5 and 2.7 (#1243). Thanks @jdufresne
• Remove deprecated --index/--no-index option from pip-compile (#1234). Thanks @jdufresne

Features:

• Use pep517 to parse dependencies metadata from setup.py (#1311). Thanks @astrojuanlu

Bug Fixes:

• Fix a bug where pip-compile with setup.py would not include dependencies with environment markers (#1311). Thanks @astrojuanlu
• Prefer === over == when generating requirements.txt if a dependency was pinned with === (#1323). Thanks @IceTDrinker
• Fix a bug where pip-compile with setup.py in nested folder would generate setup.txt output file (#1324). Thanks @peymanslh
• Write out default index when it is provided as --extra-index-url (#1325). Thanks @fahrradflucht

Dependencies:

• Bump pip minimum version to >= 20.3 (#1340). Thanks @atugushev